Hello! I recently purchased the A-153 kit as well for my 70 duster. I wanted to keep my SBP also as I want to keep my 15" ralley wheels. Kit is great but the rotors only came with studs for the big bolt pattern. Called SSBC & they said just re-use the studs in different holes but that won't work as the SBP require 7/16 20 threads. Called Napa as that's where the rotors came from and they were of little help. Did you run into this also, and if so, do you recall which wheel studs you wound up using? Thank you.